scholarly journals Diagnosing the technical condition of the diesel cylinder-piston group

2021 ◽  
Vol 264 ◽  
pp. 04061
Author(s):  
Mukhammad Valiev ◽  
Khusan Kosimov
Keyword(s):  
Diesel Engines ◽  
Objective Assessment ◽  
Technical Condition ◽  
Working Process ◽  
Piston Group ◽  
Cylinder Piston ◽  
Diesel Cylinder ◽  
Integral Assessment ◽  
Locomotive Diesel

The reliability of locomotive diesel engines largely depends on a timely and objective assessment of the technical condition of its equipment during operation. The article proposes a technique for the integral assessment of the technical state of the quality of the working process in a diesel cylinder using on-board diagnostics.

scholarly journals Assessment of the impact of the technical condition of the cylinder-piston group parts on nitrogen oxide emissions

2021 ◽  
Vol 2131 (5) ◽  
pp. 052058
Author(s):  
O Roslyakova ◽  
V Zaitsev ◽  
D Panov
Keyword(s):  
Diesel Engine ◽  
Diesel Engines ◽  
Technical Condition ◽  
Working Process ◽  
Mixture Formation ◽  
Special Equipment ◽  
Harmful Emissions ◽  
Marine Diesel ◽  
Cylinder Piston ◽  
The Impact

Abstract Nowadays, a lot is paid to environmental protection issues, including those related to reducing emissions from ships of the sea and river fleet, which is reflected in many works. Constant control over the content of harmful emissions in the environment forces us to deal with the issues of reducing emissions from diesel engines at the design stages and during operation. The solution to this problem allows us to consider 2 directions: constructional and the use of special equipment for capture and neutralization. In the best case, a combined method can be used, i.e. constructional with the use of capturing equipment for harmful components in diesel exhaust gases. This paper presents an analysis of the influence of various factors that reduce the load on the atmospheric air from nitrogen oxides of marine diesel engines, namely, from the operating settings of the diesel engine and its wear. On the ships of the river fleet, diesel engines are used with various mixture formation with volumetric, volumetric-film, vortex mixture formation. The leader in the listed group is the volumetric mixture engines. The paper provides an assessment of the research carried out to analyze various methods of influencing the working process of a diesel engine - the type of mixture formation, wear of the cylinder sleeve in order to determine their influence on the formation of NOx emissions.

scholarly journals The analyses of working process unstable in combustion chamber of ship internal-combustion engine

2021 ◽  
Vol 2131 (2) ◽  
pp. 022064
Author(s):  
A Nikitin ◽  
V Poberezhnyy
Keyword(s):  
Continuous Monitoring ◽  
Combustion Engine ◽  
Technical Condition ◽  
Thermal Engineering ◽  
Working Process ◽  
Piston Group ◽  
Marine Diesel ◽  
Cylinder Piston ◽  
Unstable Combustion ◽  
Combustion Processes

Abstract The article considers examples of unstable combustion processes in individual cylinders of marine diesel installations. It is shown that the instability of thermal engineering processes is determined by the grade of fuel, fuel preparation, wear of the cylinder-piston group and fuel equipment. The necessity of continuous monitoring of the technical condition of the power plant during operation is shown.

scholarly journals Методика для трибодиагностики судовых крейцкопфных дизелей на основе имитационного моделирования

2020 ◽  
Author(s):  
A.V. Golenishev ◽  
A.V. Nadezkin ◽  
M.E. Starchenko
Keyword(s):  
Diesel Engine ◽  
Simulation Model ◽  
Technical Condition ◽  
Operating Conditions ◽  
Marine Diesel Engine ◽  
Threshold Values ◽  
Piston Group ◽  
Marine Diesel ◽  
Cylinder Piston ◽  
Wear Products

Рассматриваются подходы по определению пороговых значений концентрации продуктов износа в отработанном цилиндровом масле, характеризующие переход объекта диагностирования судового крейцкопфного дизеля из одного технического состояния в другое. Показано, что существующие методики не учитывают индивидуальные особенности и техническое состояние деталей цилиндропоршневой группы. Предложено для решения задачи их трибодиагностики использовать разработанную имитационную модель, позволяющую провести моделирование процесса изнашивания цилиндровой втулки и поршневых колец судового дизеля и на основании полученных расчетов определить концентрацию продуктов износа поступивших в отработанное цилиндровое масло при различной скорости изнашивания трущихся деталей. Данные о фактической концентрации продуктов износа в отработанном цилиндровом масле в дальнейшем соотносятся с результатами моделирования, что позволяет оценить техническое состояние деталей цилиндропоршневой группы двигателя. Представлены результаты моделирования по определению пороговых значений концентрации продуктов износа в отработанном цилиндровом масле, характеризующее переход судового дизеля из исправного в несправное техническое состояние. Даны практические рекомендации по выбору пороговых значений содержания продуктов износа в отработанном цилиндровом масле для различных типов судовых крейцкопфных дизелей и условий их эксплуатации.The article examines approaches to determine the threshold values of the concentration of wear debris in used cylinder oil that characterize the transition of a ship crosshead diesel engine unit under test from one technical condition to another. It is shown that the existing methods do not take into account the individual characteristics and technical condition of the parts of the cylinder-piston group. To solve the problem of tribodiagnostics, it is proposed to use the developed simulation model, which allows modeling the wear process of the cylinder bushing and piston rings of a marine diesel engine and, based on the obtained results, determining the concentration of wear products issued in the used cylinder oil at different wear rates of the moving parts. The data on the actual concentration of wear products in the used cylinder oil are subsequently correlated with the simulation model results, which makes it possible to evaluate the technical condition of the parts of the engine cylinder-piston group. The article presents the results of modeling of threshold values determination of the concentration of wear products in used cylinder oil, that measure the transition of a marine diesel engine from a working condition to a malfunctioning technical condition. Practical recommendations are given on choosing threshold values for the concentration of wear products in used cylinder oil for various types of marine crosshead diesel engines and their operating conditions.

scholarly journals Research and development of commercially viable lubricants to intensify working life of marine diesel engines and cylinder piston group in internal combustion engines

2021 ◽  
Vol 2021 (4) ◽  
pp. 62-74
Author(s):  
Vasiliy Aleksandrovich Chanchikov ◽  
Ivan Nikolaevich Guzhvenko ◽  
Alexandr Ivanovich Andreev ◽  
Marina Aleksandrovna Shulimova ◽  
Sergey Aleksandrovich Svekolnykov
Keyword(s):  
Diesel Engines ◽  
Engine Oil ◽  
Lubricating Oil ◽  
Mechanical Mixing ◽  
Friction Modifier ◽  
Marine Engine ◽  
Piston Group ◽  
Molybdenum Diselenide ◽  
Marine Diesel ◽  
Cylinder Piston

The paper presents the results of studying the influence of variable characteristics of lubricating oils for marine diesel engines (concentration of layered friction modifier in lubricating oil, viscosity of lubricating oil, contact pressure in the friction zone) on the tribological parameters of parts of the cylinder-piston group of marine diesel engines. There are considered the aspects of increasing the reliability and wear resistance of the cylinder-piston group of marine diesel engines when a layered friction modifier is added to the base lubricating oil in a concentration of 1.5 vol.%. There have been carried out the comparative tribological studies of M-16G2CS lubricating oil including an additive based on molybdenum diselenide. Dependences of the wear of parts of the cylinder-piston group of a marine engine on different parameters of the studied lubricants are shown. The wear rate of experimental samples in conditions of variable characteristics of lubricants has been studied. According to the tribological studies of lubricants and structural materials, the tribological rating of lubricating compositions containing M16G2CS marine engine oil as a base and a layered friction modifier - molybdenum diselenide as a tribologically active additive was built. The test tool for the antiwear ability of lubricants is a friction machine of an original design with abraded samples according to the “ball-cylinder” contact scheme. Mechanical mixing of the lubricating medium of “oil + additive” type on the RPU-0.8-55A rotary-pulsating unit was one of the variable parameters in the tests. The tribological efficiency of the studied antiwear additive varies depending on the type of mixing of the additive solution before adding to the base lubricating oil and makes 13-54% (the difference in the diameter of the wear spot of the sample) for mechanical mixing, and for rotary-pulsation mixing - 45-56%.

Expert assessment of the technical condition of the cylinder-piston group of the car engine

2021 ◽  
Vol 13 (1) ◽  
pp. 133-139
Author(s):  
Iryna Sarayevа ◽  
◽  
Alexander Khrulev ◽  
Oleksandr Vorobiov ◽  
◽  
...  
Keyword(s):  
Structural Parameters ◽  
Random Variable ◽  
Technical Condition ◽  
Expert Assessment ◽  
Diagnostic Parameter ◽  
Average Value ◽  
Piston Group ◽  
Cylinder Piston ◽  
The Difference ◽  
Relative Change

Informative dampers and installation methods do not dose the speed, accurately distinguish the nature of the injustice of the cylinder-piston group and check the tightness of the valves of the single-stage model of the engine, which allows a preliminary quality assessment in the production assessment. . During the inspection, the activity of the "black box" is checked for unknown structural elements, the initial diagnostic obligations that affect. The nomenclature of structural parameters that are checked is determined in accordance with existing standards. Based on the advanced model development method produced by the technical condition of the cylinder-piston group and the sealed valve of the engine, model, detailed dosing, statistical information, machines, machines, machines, machines, machines, machines, machines, machines and equipment. first, to localize the unevenness of the cylinder-piston group and the tightness of the engine valve, and secondly, to formally process the process of automated technical diagnosis; thirdly, it will provide a high rate of indiscriminate diagnosis. To assess the sensitivity of the diagnostic value as a random variable, it is proposed to evaluate not the relative change in the limit and nominal value of the controller, the relative change in the average value of the random variable within the allowable value. The diagnostic parameter is considered stable if the condition under which the absolute maximum value from the average value does not exceed "three sigma" is fulfilled. Informative in consideration is the diagnostic parameter in which the ratio of the difference between the average significant value of the random control in good and faulty state of the object to the difference of standard deviations exceeds one. Expert assessment of the technical condition of the road vehicle is associated with the determination of diagnostic parameters, structural parameters, as well as the reasons that caused the change of these parameters.

scholarly journals INCREASING OF THE INFORMATIVEVALUE OF AUTOMOBILE ENGINE DIAGNOSTICS BY MEANS OF TECHNICAL ENDOSCOPY

2018 ◽  
Vol 22 (1) ◽  
pp. 18-26
Author(s):  
E. V. Ageev ◽  
A. V. Shcherbakov ◽  
YU. G. Alekhin ◽  
S. A. Grаshcow
Keyword(s):  
Combustion Engine ◽  
Practical Importance ◽  
Technical Condition ◽  
Technical State ◽  
Design Parameters ◽  
Mutual Position ◽  
Labor Costs ◽  
Piston Group ◽  
Cylinder Piston ◽  
Technical Endoscopy

Car engine is the most complex and important unit of a car. A lot of technical, economic and environmental automobile performance depend on it. Therefore, the development of advanced methods for diagnosing the technical state of engine mechanisms and systems is of great practical importance. The most part and labor intensity of the total number of malfunctions accounts for the cylinder-piston group (GPG). The purpose of this work was to increase the informative value of the process of diagnosing the engines of VAZ front-wheel drive vehicles by using technical endoscopy. To obtain information about the level of technical condition, it is not advisable to disassemble a unit or assembly in a good operation condition, since, first, it is associated with considerable labor costs, and second, and what is important, each disassembly and change of the mutual position of the used parts leads to the reduction of the residual life by 30 - 40%. Using a technical endoscope to obtain information about the technical state of the GPG provides unique opportunities for visual diagnostics. Due to the use of a technical endoscope, it became for the first time possible to proceed while diagnosing internal combustion engine GPG to the evaluation of design parameters of the technical state, such as: the state of the hone net, grooves, scoring, scratches, which could only be performed before by automobile disassembly. In general, technical endoscopy increases the informative value of the process of cylinder-piston group diagnosing. The use of a technical endoscope reveals unique possibilities for an operative assessment of the technical condition of the object being diagnosed in order to shorten the time of detection and subsequent elimination of malfunctions.

scholarly journals ВЛИЯНИЕ ПРОТЕЧЕК РАБОЧЕГО ТЕЛА НА КООРДИНАТУ ТОЧКИ МАКСИМАЛЬНОГО РОСТА ДАВЛЕНИЯ СЖАТИЯ

2019 ◽  
pp. 59-64
Author(s):  
Алексей Валериевич Ерыганов ◽  
Роман Анатольевич Варбанец ◽  
Владислав Олегович Маулевич
Keyword(s):  
Pressure Rise ◽  
Technical Condition ◽  
Maximum Pressure ◽  
Compression Pressure ◽  
Compression Process ◽  
Flow Area ◽  
Indicator Diagram ◽  
Piston Group ◽  
Rate Of Increase ◽  
Cylinder Piston

The article discusses the analysis of the parameters of the compression process, which is carried out according to the results of engine indication. The solution to this problem allows us to evaluate the technical condition of the cylinder-piston group parts. According to the requirements of most classification societies, the deviation of the compression pressure on this cylinder from the engine average should not exceed 2.5%. The dependence of the compression pressure value on the pressure of the supercharger makes it difficult to obtain correct diagnostic conclusions about the condition of the cylinder-piston group when the technical condition of the gas turbine compressor deteriorates. The existing publications investigated the position on the indicator diagram of the point at which the rate of increase in compression pressure reaches its maximum, and its position was demonstrated to be almost invariant with respect to pressure. This fact makes it possible to calculate its position relative to the top dead center of the engine even before the start of indexing and to accept the calculated value as a first approximation in the algorithmic synchronization of the display results. However, the leakage of the working medium, inevitably present in the engine, was not considered. Therefore, the problem of the displacement of the coordinate point of the maximum rate of pressure increase in the presence of leaks is legitimate. The task is solved applying a mathematical model consisting of three equations (condition, mass conservation and the first law of thermodynamics), written in a differential form and integrate at each calculated step. As an argument, the selected angle of rotation of the crankshaft of the engine. Nevertheless, to solve such systems of equations analytically considering the leaks in the full formulation is extremely difficult. Therefore the effective flow area of the piston rings was given in modeling the workflow is considered to be constant throughout the calculations. The modeling results determine the position of the point of maximum pressure rise rate on the indicator diagram, which can be used as an indirect indicator in the integral analysis of the engine technical condition

scholarly journals THE CONCEPT OF COMBUSTION PROCESS ORGANISATION IN A BOXER TWO-STROKE DIESEL ENGINE AT A HIGH LEVEL OF BOOSTING

2021 ◽  
pp. 45-51
Author(s):  
I.V. Parsadanov ◽  
A.G. Lal
Keyword(s):  
Diesel Engine ◽  
Diesel Engines ◽  
Fuel Efficiency ◽  
Combustion Process ◽  
Mixing Efficiency ◽  
Diesel Generator ◽  
Piston Group ◽  
Air Supply ◽  
Cylinder Piston ◽  
High Level

Based on the analysis and synthesis of previously performed theoretical and practical studies, the paper proposes a concept of combustion process organization in a boxer two-stroke diesel engine at a high level of boosting. Such diesel engines are produced in Ukraine and are widely used in land, sea and rail transport, as diesel generator plants. The implementation of this concept will ensure the reduction of the thermal stress of the cylinder piston group for these diesel engines, while improving fuel efficiency. The features of the organization of the working process in a boxer two-stroke diesel engine are briefly considered. The contribution of Ukrainian, Russian and American scientists to the development and improvement of their mixing efficiency is noted. Following the purpose of the research, which determines the choice of directions for the development and implementation of technical solutions for the simultaneous reduction of fuel consumption and thermal tension of the cylinder-piston group when forcing a boxer two-stroke diesel engine, it is proposed to use the amount of released heat as a criterion for evaluating the quality of combustion. Based on the results of earlier studies, conceptual foundations for increasing the efficiency of the combustion process of a highly boosted boxer two-stroke diesel engine have been developed, which are directly related to the air supply, fuel supply, the rationale for choosing the shape of the combustion chamber are determined by the amount of heat released during combustion and the nature of its change in the crankshaft rotation angle.

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